--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/fontservices/textshaperplugin/IcuSource/layout/AlternateSubstSubtables.cpp	Tue Feb 02 02:02:46 2010 +0200
@@ -0,0 +1,45 @@
+/*
+ *
+ * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
+ *
+ */
+
+#include "LETypes.h"
+#include "LEGlyphFilter.h"
+#include "OpenTypeTables.h"
+#include "GlyphSubstitutionTables.h"
+#include "AlternateSubstSubtables.h"
+#include "GlyphIterator.h"
+#include "LESwaps.h"
+
+U_NAMESPACE_BEGIN
+
+le_uint32 AlternateSubstitutionSubtable::process(GlyphIterator *glyphIterator, const LEGlyphFilter *filter) const
+{
+    // NOTE: For now, we'll just pick the first alternative...
+    LEGlyphID glyph = glyphIterator->getCurrGlyphID();
+    le_int32 coverageIndex = getGlyphCoverage(glyph);
+
+    if (coverageIndex >= 0) {
+        le_uint16 altSetCount = SWAPW(alternateSetCount);
+
+        if (coverageIndex < altSetCount) {
+            Offset alternateSetTableOffset = SWAPW(alternateSetTableOffsetArray[coverageIndex]);
+            const AlternateSetTable *alternateSetTable =
+                (const AlternateSetTable *) ((char *) this + alternateSetTableOffset);
+            TTGlyphID alternate = SWAPW(alternateSetTable->alternateArray[0]);
+
+            if (filter == NULL || filter->accept(LE_SET_GLYPH(glyph, alternate))) {
+                glyphIterator->setCurrGlyphID(SWAPW(alternateSetTable->alternateArray[0]));
+            }
+            
+            return 1;
+        }
+
+        // XXXX If we get here, the table's mal-formed...
+    }
+
+    return 0;
+}
+
+U_NAMESPACE_END